I am wondering if it makes that big of a difference if some companies are using stainless vs copper boilers. On the Dream T, the brew boiler is copper (actually a combo of brass, copper and stainless) and the steam boiler is stainless. Is this a cost saving measure? should I only consider buying machines that use two copper boilers only (DB)??

I don't think it makes that big of a difference, because there are well regarded machines such as the LM GS/3 and current Cremina, that use a stainless steel boiler. The GS/3 portafilters are also now made from stainless steel.

The metal properties are very different, and people have made a big deal out of copper's high heat conductivity. But the existence of these new designs (and probably some old designs as well) proves that a successful design can be made with either metal.

I don't think it makes that big of a difference, because there are well regarded machines such as the LM GS/3 and current Cremina, that use a stainless steel boiler. The GS/3 portafilters are also now made from stainless steel.

The metal properties are very different, and people have made a big deal out of copper's high heat conductivity. But the existence of these new designs (and probably some old designs as well) proves that a successful design can be made with either metal.

I did read something somewhere that stainless can hold on to bacteria.. My guess is that is the reason La Spaziale used stainless for the steam boiler and not the brew boiler. The high temp in the steam boiler kills any bacteria..

The temp in the brew boiler is also sufficient to kill every known human pathogen. In fact, it's considerably hotter than your automatic dishwasher, which only heats to about 135F. I wouldn't lose another second of sleep over the bacteria "issue". btw, to add to my credibility...I have a BA in cellular and molecular biology, with a minor in chemistry...and am an MD.

.Always remember the most important thing is what ends up in your cup!

The temp in the brew boiler is also sufficient to kill every known human pathogen. In fact, it's considerably hotter than your automatic dishwasher, which only heats to about 135F. I wouldn't lose another second of sleep over the bacteria "issue". btw, to add to my credibility...I have a BA in cellular and molecular biology, with a minor in chemistry...and am an MD.

The temp in the brew boiler is also sufficient to kill every known human pathogen. In fact, it's considerably hotter than your automatic dishwasher, which only heats to about 135F. I wouldn't lose another second of sleep over the bacteria "issue". btw, to add to my credibility...I have a BA in cellular and molecular biology, with a minor in chemistry...and am an MD.

The temp in the brew boiler is also sufficient to kill every known human pathogen. In fact, it's considerably hotter than your automatic dishwasher, which only heats to about 135F. I wouldn't lose another second of sleep over the bacteria "issue". btw, to add to my credibility...I have a BA in cellular and molecular biology, with a minor in chemistry...and am an MD.[

I should have guessed you are a radiologist (emrad) ... I used to do MRI Applications..

Although brew boiler temperatures (195-203F) are sufficient to kill most vegetative bacterial cells, much higher temperatures are required to kill bacterial spores (which are like bacterial "seeds"). Temperatures around 250F for many minutes are required to kill the spores of Clostridium botulinum, the bacteria that causes deadly botulism.

It would be virtually impossible to contract botulism from an espresso; nevertheless your statement above is flat out wrong.

Symbols: = New Posts since your last visit = No New Posts since last visit = Newest post

Forum Rules:No profanity, illegal acts or personal attacks will be tolerated in these discussion boards.No commercial posting of any nature will be tolerated; only private sales by private individuals, in the "Buy and Sell" forum.No SEO style postings will be tolerated. SEO related posts will result in immediate ban from CoffeeGeek.No cross posting allowed - do not post your topic to more than one forum, nor repost a topic to the same forum.Who Can Read The Forum? Anyone can read posts in these discussion boards.Who Can Post New Topics? Any registered CoffeeGeek member can post new topics.Who Can Post Replies? Any registered CoffeeGeek member can post replies.Can Photos be posted? Anyone can post photos in their new topics or replies.Who can change or delete posts? Any CoffeeGeek member can edit their own posts. Only moderators can delete posts.Probationary Period: If you are a new signup for CoffeeGeek, you cannot promote, endorse, criticise or otherwise post an unsolicited endorsement for any company, product or service in your first five postings.